Fix/ignore apollo prop file

[swr1bm86]

after ut, apollo will generate a trivial config file.

Untracked files:
  (use "git add <file>..." to include in what will be committed)

	config_center/apollo/mockDubbog.properties.json

[codecov-io]

Codecov Report

Merging #372 into master will decrease coverage by 0.46%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #372      +/-   ##
==========================================
- Coverage   67.16%   66.69%   -0.47%     
==========================================
  Files         145      145              
  Lines        7692     7692              
==========================================
- Hits         5166     5130      -36     
- Misses       2036     2072      +36     
  Partials      490      490

Impacted Files	Coverage Δ
protocol/dubbo/listener.go	56.75% <0%> (-6.49%)	⬇️
protocol/dubbo/pool.go	74.77% <0%> (-6.43%)	⬇️
protocol/dubbo/client.go	63.75% <0%> (-5%)	⬇️
cluster/cluster_impl/failback_cluster_invoker.go	78.49% <0%> (-2.16%)	⬇️

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[AlexStocks]

@zjhmale thx for your pr. the target branch should be develop. thank you.

[zouyx]

@zjhmale thanks for your PR. In develop branch, UT will delete this file once it finish. you can try it.

dubbo-go/config_center/apollo/impl_test.go

Line 269 in 67ccfb2

func deleteMockJson(t *testing.T) {

[swr1bm86]

ok, thanks for the hint, will checkout develop then